Cheat Sheet about Linux commands

Keyboard Shortcuts Commands

Keyboard Shortcuts	Description
Ctrl + K	Cut and add to the clipboard part of the line after the cursor
Ctrl + U	Cut and add to the clipboard part of the line before the cursor.
Ctrl + W	Cut and add to the clipboard one word before the cursor was.
Ctrl + C	Kill process running in the terminal.
Ctrl + Z	Stop the current process.
Ctrl + R	Recall the last command that matches the provided characters.
Ctrl + O	Run the previously recalled command.
Ctrl + G	Exit command history without running a command.
Ctrl + Y	Paste from clipboard.

Users

Useradd

useradd
This command creates a new user.

Common Options:
- -m : Create the user’s home directory if it doesn’t exist.
- -d : Specify a custom home directory.
- -G : Add user to one or more groups.
- -s : Specify the login shell.
- -c : Add a comment (e.g., user’s full name).

Userdel

userdel
This command deletes a user.

Common Options:
- -f : Delete Linux user account with force removal of files
- -r : Remove Linux user account including home directory and mail spool

Usermod

usermod
This command modifies a user.

Common Options:
- -e : To change the expiry date of a user
- -d : To change the home directory of a user
- -g : To change the group of a user
- -l : To change user login name
- -c : To add a comment for a user
- -L : To lock a user
- -U : To unlock a user
- -s : To create a shell for the user

Groups

Groupadd

groupadd
This command creates a new group.

Common Options:
- -g : This parameter is used to specify the numerical ID for the group.
- -c : create a group with attached comment

Groupdel

groupdel
This command deletes a group.

Common Options:
- -f : Delete Linux user account with force removal of files
- -r : Remove Linux user account including home directory and mail spool

Groupmod

groupmod
This command modifies a group.

Common Options:
- -g : Changes the group ID
- -n : Changes the name of the group
- -U : Lists members of a group
- -o : Allows using duplicate group ID

A little of everything

COMMANDS	Description
man ___	It is a manual for near every command
ls	List directory contents
cd	To change directories
whatis ___	Shows the section “name” in man command
whoami	Shows in which account you are
clear	“Deletes” all the commands of the screen
echo ___	Prints text to the screen
history	Shows to you the commands that you have entered previously
mkdir ___	Create a new directory

COMMANDS	Description
date	Shows the date that have configured
reboot	Restarts the systems
apt update	Updates the packages
apt upgrade	Updates the installed packages
apt install ___	Installs a package
apt remove ___	Removes a package
cp ___ ___	Copies the file or directory
rm ___	Removes a file
chmod ___ ___	To change the file permissions